Error in registry for extension “Exchange Extensions;?”
Yes it is a strange error message. After removing McAfee Anti-Virus from one of my machines I kept getting this each time I launched Outlook:

I thought I could stop the error by going into advanced options and disable the old McAfee extensions. Unfortunately - nothing from McAfee was there

After doing some searching over at MS I found this KB article:
http://support.microsoft.com/kb/823633
The short version is:
Drill down to this registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\Client\Extensions
The delete the value named “Exchange Extensions”
Then launch Outlook again. Now the errors are gone, and Outlook will recreate the key.
I also realized that this bug was fixed in SP1 of Outlook 2003, so I promptly upgraded it so I would not have it happen again.
Lastly, it seems that the removal of McAfee was only coincidental - According to the MS fix these are the steps you can take to reproduce the error:
1. Send an e-mail message to a recipient by using the following method:
Right-click an object, point to Send To, and then click…
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Written by Steve Wiseman on October 14th, 2007 with 1 comment.
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